Question

Please give proper equations and calculations~ !

thanks a lot

Show transcribed image textA shunt-connected a DC motor has zero rotational losses and R A= 0. Assume that RA and R adj is constant [except in part (d)] and that phi is directly proportion to field current. For VT = 200 V and P out = 2 hp. The speed is 1200 rpm. What is the effect on IA and speed if: The load torque doubles. The load power doubles. VT is changed to 100V and P out remains constant RA + Rad j is doubled in value and P out remains constant?